Chemical Engineering > GATE 2018 > Optimization
A person is drowning in sea at location R and the lifeguard is standing at location P. The beach boundary is straight and horizontal, as shown in the figure.
The lifeguard runs at a speed of VL and swims at a speed of VS.
In order to reach the drowning person in optimum time, the lifeguard should choose point Q such that __________.
A
sin2θL/sin2θS = VS/VL
B
sin θL/sin θS = VS/VL
C
sin2θL/sin2θS = VL/VS
D
sin θL/sin θS = VL/VS

Correct : d

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